Bit-brace.



S. N. HALL 6: C. M. PETERSEN.

Patented Jan. 16, 1917.

Attorneys m: mums Psrzns to" Fnnmunm. wqsnma mu. m c

I T STATS ATET FFTCE.

SAMUEL N. HALL, OF MEMPHIS, TENNESSEE, AND CARL M. PETERSEN, OFWASHINGTON, DISTRICT OF COLUMBIA, ASSIGNORS T0 SAID SAMUEL HALL.

BIT-IBRACE.

Specification of Letters Patent.

Patented Jan. 16, 1917.

T 0 all whom it may concern:

Be it known that we, SAMUEL N. HALL and CARL M. Pn'rnnsnn, citizens ofthe United States, residing at Memphis, in the county of Shelby andState of Tennessee, and Washington, District of Columbia, respectively,have invented a new and useful Bit-Brace, of which the following is aspecification.

This invention relates to bit braces and is more especially designed asan improvement upon the structure disclosed in anapplication filed bySamuel N. Hall on February 9, 1914, Serial No. 817,618.

One of the objects, of the invention is to provide a bit brace havingimproved means whereby the chuck can be rotated at either of two speedsduring the operation of the crank arm, the parts of the mechanism beingso assembled that they will not become displaced accidentally and willdistribute strains in such a manner as to materially strengthen thestructure and prevent the parts from breaking under ordinary usage.

A further object is to provide a bit brace having improved means forcoupling the parts thereof whereby the same can be operated at either ofthe two speeds.

Another object is to provide a supplemental grip or handle by means ofwhich the brace can be properly held during the actuation of the speedmultiplying mechanism combined with the brace.

YVith the foregoing and other objects in riew which will appear as thedescription proceeds, the invention resides in the com-' bination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made within thescope of what is claimed, with-v out departing from the spirit of theinvention. I

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings :,Figure is a view partly in'ele'vation and partly insection of a brace embodying the present improvements. Fig. 2 is anenlarged section on line AB Fig. 1. Fig. 3 is a section on line CD Fig.1, said section being on an enlarged scale. Fig. 4.- is an enlargedsection on line EF Fig. 1. Fig. 5 is a sectlon on line G-H Fig. 1, partsbeing broken away.

Fig. 6 is an enlarged section on line TJ Flg. 1. Fig. 7 is a perspectiveview of the lower end portion of the chuck spindle. Fig. 8 is anelevation thereof.

Referring to the figures by characters of reference 1 designates asleeve engaged fixedly by one end portion of a crank arm 2 the other endof which is provided with a knob 3 of the usual or any preferredconstruction. That end of the crank arm engaging the sleeve 1 is offsetas shown at 1 and is engaged by a grip 5 disposed at right angles to thelongitudinal center of the sleeve 1.

Mounted for rotation within the sleeve 1 is a tubular stem 6 extendingfrom the center of a shallow cylindrical gear case 7 which bears uponthe upper end of the sleeve 1. A ring or collar 8 is secured to thelower end of the stem 6 and anti-friction devices, such as balls 9, areinterposed between this collar and the lower end of sleeve 1.

Formed within the inner face of the wall of the gear case 7 is a ballrace 10 adapted to register with a similar race 11 formed upon the outerface of an internal annular gear 12 which is formed upon and dependsfrom a disk 13 constituting the top of the gear case and which disk isprovided, upon its periphery, with ratchet teeth or notches 1a. Anopening 15 is formed in the wall of the gear case and anti-frictionballs are adapted to be inserted through this opening into theregistering races 10 and 11 so as thus to hold the gear 12 againstdisplacementrelative to. the gear case and also to reduce frictionbetween the parts. Opening 15 can be closed in any desired manner, as bymeans of a screw plug 16.

Secured upon the disk 13 is an arm 17 extending radially therebeyond andprovided with depending side flanges 18 in which a shifting pin 19 ismounted to slide transversely. This pin is provided at each end with ahead 20 whereby it can be manipulated readily and a cam-shaped recess 21is formed longitudinally. within the middle portion of the pin and isadapted to receive the terminals of opposed pawls 22 which pawls projectup to and normally engage the ratchet 14. A spring 23 is interposedbetween the pawls and serves to hold them normally in active positions.It will be apparent by referring to Fig. 5 thatwhen the pin '19 isshifted longitudinally in one dithe pin 19 is shifted in the oppositedirection, the positions of the pawls are reversed. When pin 19 is inits intermediate position, as shown in Fig. 5, both of the pawls are inengagement with the ratchet and oscillation of the arm 17 relative todisk 13 is thus prevented.

That end of the arm 17 remote from the disk 13 is forked, as shown at 24and is provided with guide ears 25 upon the top thereof while dependingfrom the sides of the fork are cars 26 engaged by a clamping screw 27.This clamping screw has a small hand lever 28 extending from one endthereof whereby, by giving a slight movement to the lever 28 in onedirection, the sides of the fork 24 will be shifted toward each otherwhereas, by moving the lever 28 in the opposite direction, said sideswill be permitted to spring or move apart. When the sides of the forkare shifted toward each other,the ears 25 will clamp upon aslide 29which constitutes an extension of the arm 17, this slide being providedat its outer end with a grip 30 made up of movably connected sectionsadapted to engage the intermediate portion of the crank arm 2. Inasmuchas this grip constitutes no part of the present invention, but has beenfully described in the application of Samuel N. Hall hereinbeforereferred to, it is not deemed necessary to describe or illustrate thesame in detail in the present case.

at diametrically opposed points are guide sleeves 37 within each ofwhich is slidably mounted a locking pin 38. The lower end of each pin isprovided with a head 39 whereby it can be readily engaged and actuatedwhile the opposed or upper end of each pin is normally seated in a notch40 formed in the lower face of the disk 13. Each. pin 38 is provided, atan intermediate point, with a broad annular groove 41 which graduallyincreases in depth from its center to its sides and projecting into eachgroove is a spring finger 42 carried by the guide 37 in which the pin ismounted. This spring finger is adapted to be seated in either side orend portion of the groove 41 so as thus to hold the pin 38 in eitherraised or lowered position.

Extending from the sleeve 1 is an ear 43 having a notch 44 into whichone of the pins 38 is adapted to project when withdrawn from the notch40.

The lower end of the spindle 31 is cut away to provide a shoulder 45 andthe terminal of the spindle is beveled as at 46. This spindle projectsinto and is secured .within the tubular chuck 47 the inner end of thechuck being provided with a head 48 spaced from the sleeve 1 and stem 6by a series of anti-friction balls 49 and abearing disk 50 engaged bytheballs. The chuck has a spring 51 secured to the outer side thereof bya screw 52 or the like, the lower or free end of the spring beingprovided with a beveled head 53. A sleeve 54 is mounted for rotation onthe chuck and has an interior annular groove 55 into which the head'52projects so that the sleeve is thus held against longitudinal movementrelative to the chuck. That portion of the sleeve opposite the head 53of the spring 51 is formed with a cam-shaped recess 56 so that, when thesleeve is rotated in one direction on the chuck, the spring 51 will bepressed inwardly whereas, when the sleeve 54 is rotated in the oppositedirection, the spring will be released and permit the head 53 to shiftoutwardly.

The chuck is adapted to receive a bit or other tool indicated generallyat 57 and which has its inner end reduced, as at 58 thus to lap thereduced end of the spindle 31. This tool 57 has a notch 59 so locatedthat when the tool is in engagement with the spindle 31, the notch willbe directly opposite the head 53. Consequently by giv- 'ing a short turnto the sleeve 54, the head 53 can be caused to shift into the notch 59and thus lock the tool to the spindle 31.

However by rotating sleeve 54 in the oppotion of the balls in the races10 and 11 will prevent the annular gear 12 from becoming displacedwithin the gear case and will also reduce friction between the parts.While the two pins 38 are seated in the notches 40, the disk 13 will belocked to the gear case with the result that, when the grip 30 isdisengaged from crank arm 2 and is shifted inwardly toward disk 13,.thegrip 5 canbe engaged by one hand, the knob 3 pressed against the body ofthe user, and the grip 30 employed for rotating disk 13 and the gearcase. During this operation, the chuck will rotate once during eachcomplete rotation of the gear case, the anti-friction balls 9 serving atthis time to reduce friction. By withdrawing one of the pins 38 from itsnotch l0 and seating its lower end in the recess 44 in ear 48, the disk13 will not only be held against rotation independently of the gear case7, but said gear case will also be held against rotation independentlyof the sleeve 1 so that the chuck can thus be rotated by means of thecrank arm 2 and in dependently of the grip 30 and the parts connectedthereto. By now withdrawing the other pin 38 from its notch 4E0 the disk13 will be released from the gear case so that, by disengaging grip 30from crank arm 2, holding said grip in one hand and holding the grip 5in the other hand, the disk 13 can be rotated by means of the grip 30and motion will be transmitted from the annular gear 12 through gears 35and 83 to gear 32, with the result that the speed of rotation oi spindle31 will be multiplied, friction at this time being reduced by the balls49.

Obviously by utilizing the pawls 22 and the pin 19, the brace can beused as a ratchet brace.

lVhat is claimed is 1. The combination with a sleeve, a tubular stemmounted for rotation therein, and a gear case revoluble with the stem,of a chuck spindle mounted for rotation within the stem, sp'eedmultiplying gearing within the case for actuating the spindle, a crankarm connected to the sleeve, and means op erating independently of thecrank arm for actuating the gearing.

2. The combination with a sleeve, a tuloular stem mounted for rotationtherein, and a gear case revoluble with the stem, of a chuck spindlemounted for rotation within the stem, speed multiplying gearing withinthe case for actuating the spindle, a crank arm connected to the sleeve,means operating independently of the crank arm for actuating thegearing, and means carried by the gear case for engaging the sleeve tohold the case against rotation relative thereto.

3. The combination with a sleeve, a tubular stem mounted for rotationtherein, and a gear case revoluble with the stem, of a chuck spindlemounted for rotation within the stem, speed multiplying gearing withinthe case for actuating the spindle, a crank arm connected to the sleeve,means operating independently of the crank arm for actuating thegearing, and means carried by the gear case for locking the gearingagainst operation Within the gear case, and means upon the sleeve forengagement by said locking means when the gearing is released, forholding the gear case against rotation relative to the sleeve.

4:. The combination with a sleeve, and a crank arm fixedly connected tothe sleeve, said crank arm having an offset grip portion extendingradially from the. sleeve, of a tubular stem mounted for rotation withinthe sleeve, a gear case carried thereby, a ratchet disk constituting aclosure for the gear case, an internal gear depending from the ratchetdisk and within the gear case, means for rotating said ratchet disk withor independently of the crank arm, a chuck spindle mounted for rotationwithin the tubular stem, gearing within the case for transmitting motionto the spindle from the internal gear, means carried by the gear casefor engaging the disk to lock the gearing against operation, and meansupon the sleeve for engagement by said locking means when the gearing isreleased, to hold. the gear case and stem against rotation relative tothe sleeve during the rotation of the internal gear.

5. The combination with a sleeve, a crank arm fixedly connected thereto,of a tubular stem mounted for rotation within the sleeve, a gear casecarried thereby, a disk constituting a closure for the gear case, aninternal gear depending from and revoluble with the disk, said gearbeing located within the case, a chuck spindle mounted for rotationwithin the stem, a gear thereon, speed multiplying means within the gearcase for transmitting motion from the internal gear to the spindle, alocking pin slidably mounted in the gear case and adapted to engage thedisk to hold the gears against operation, and means upon the sleeve forengagement by the pin to hold the case against rotation relative to thesleeve when the gears are unlocked, and means for rotating the disk whenthe gears are disengaged.

In testimony that we claim the foregoing as our own, we have heretoaffixed our signatures in the presence of two witnesses.

SAMUEL N. HALL. CARL M. PETERSEN. Witnesses:

IVY E. SIMrsoN, PHILOMENA A. ROGKELLI.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

